/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package py.netty.core.twothreads;

import io.netty.util.concurrent.Promise;
import io.netty.util.internal.ThrowableUtil;
import org.slf4j.Logger;

public final class PromiseLoggingUtil {
  private PromiseLoggingUtil() {
  }

  public static void tryCancel(Promise<?> p, Logger logger) {
    if (!p.cancel(false) && logger != null) {
      Throwable err = p.cause();
      if (err == null) {
        logger.warn("Failed to cancel promise because it has succeeded already: {}", p);
      } else {
        logger.warn("Failed to cancel promise because it has failed already: {}, unnotified cause:",
            p, err);
      }
    }
  }

  public static <V> void trySuccess(Promise<? super V> p, V result, Logger logger) {
    if (!p.trySuccess(result) && logger != null) {
      Throwable err = p.cause();
      if (err == null) {
        logger.warn("Failed to mark a promise as success because it has succeeded already: {}", p);
      } else {
        logger.warn(
            "Failed to mark a promise as success because it has failed already: {}, unnotified"
                + " cause:", p, err);
      }
    }
  }

  public static void tryFailure(Promise<?> p, Throwable cause, Logger logger) {
    if (!p.tryFailure(cause) && logger != null) {
      Throwable err = p.cause();
      if (err == null) {
        logger.warn("Failed to mark a promise as failure because it has succeeded already: {}", p,
            cause);
      } else {
        logger.warn(
            "Failed to mark a promise as failure because it has failed already: {}, unnotified"
                + " cause: {}", p, ThrowableUtil.stackTraceToString(err), cause);
      }
    }
  }

}
